What is the term for a law passed by Congress that is unconstitutional?

The term "null and void" refers to a law that is passed by Congress but is found to be unconstitutional. When a court determines that a law conflicts with the Constitution, it effectively has no legal effect, meaning it cannot be enforced. The Constitution is the supreme law of the land, and any law that contradicts its provisions is rendered ineffective from the moment it is declared unconstitutional.

This concept emphasizes the principle of judicial review, where courts have the authority to review laws and executive actions to ensure they comply with the Constitution. Once a law is declared null and void, it cannot be applied or enforced, highlighting the power of the judiciary in maintaining the rule of law and upholding constitutional supremacy.

In contrast, other terms like "invalid and unenforceable," "legally binding," and "constitutionally acceptable" do not accurately capture the definitive legal status of an unconstitutional law. "Invalid and unenforceable," while related, does not convey the same legal finality as "null and void," and "legally binding" and "constitutionally acceptable" are terms that would apply to laws that adhere to constitutional requirements rather than those that do not.